It's easy but you have to know how to manage yourself within the country you are in, because there are certain things that can affect when you make the document of ownership and sale of the property, I think you could say that you want to sell your house (you give the price in FIAT) AND You say that the payment can be made in BTC, the idea of this is that the documents are in FIAT money so that they do not cause problems, and that, at least in my country, would already be a separate treaty of mutual agreement, taking care of the protocols that exist in the fiscal association bodies before the government.